Mr Northey invented the Hook & Claw principle in the 1930's. Like all good inventions the concept is quite simple. Two contra rotating rotors compress the gas and the hooks allow inlet and discharge through ports. There is no contact between the rotating parts and no need for lubrication. There is no sealing liquid either, so the air or gas handled is left clean and uncontaminated. There is no wear and no consumption of oil or other liquid.

The Northey hook and claw machine can be used in vacuum or compression. They are true positive displacement machines which means the flow is proportional to the speed and relatively high compression ratios can be used.

Click here to download an animation of the rotors.

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